package com.doraemon.staging.mvc.springmvc.interceptor;

import com.doraemon.staging.util.ObjectUtil;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class JsonpSupportInterceptor implements HandlerInterceptor {

    public static final String DEFAULT_CALLBACK = "callback";

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        boolean isJSONP = !ObjectUtil.isEmpty(request.getParameter(DEFAULT_CALLBACK));
        if (isJSONP) {
            response.setContentType("application/x-javascript");
        }
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
    }
}
